Search results

As the solid granule medium is single and independent, its mechanical characteristics can be summarized as loose and dynamic, the former refers to the physical features, grain size and disperse of the shape, while the latter means the transient and fluctuation movement with collision, particle cohesion, clump abruption and fracture.
Introduction of DEM The DEM was first proposed by Cundall, etc. in the late 70s of 20th century [7], whose basic idea is simplifying the particle group into a collection of a finite number of discrete components with certain shape and mass, for the particle system, a single particle (circle disk or ball) is treated as an element, and the group behavior of granules is described according to the interaction forces between elements and Newton's laws of motion.
After loading, the force chains gradually get dense, with the formation of a number of short and thick strong chains, the external load are transmitted.

Introduction In Al-Si hypoeutectic alloys, trace level additions of Na or Sr refines the eutectic Al grains and the coarse plates of eutectic Si to a fine morphology [1-3].
The number density at each alloy temperature was evaluated based on the molar weight and molar volume data obtained from the FactSage thermodynamic database software*.
(1) In Eq. 1, νo is a constant calculated from the Lindemann’s melting point atomic frequency formula modified for metals by Iida et al [16], n is the number density, xAl, xSI are the concentrations of Al and Si, respectively, P(Al) and P(Si) are the proportions of vibrating atoms of Al and Si in the liquid, and a, b and c are values of r (radial distance form a given centre atom) corresponding to the first minimum of the partial pair correlation functions gAl-Al(r) , gSi-Si(r) ard gAl-Si(r).

To reduce the unnecessary number of elements and to guarantee the calculation is performable, element type transition in the space must be carried out.
The total elements amount of ChaHanWuSu CFRD is 18,981 and the total nodes number is 20,443.
Constitutive models 3.1 Coarse–grained material constitutive model Nonlinear elastic Duncan-Chang E-B model [1] which widely used in China is adopted to simulate the behavior of Rockfill materials.

SEM surface of the second layer of MgB2 superconducting film The SEM photo of the surface of the second layer MgB2 film was shown in figure 4, we could see from this photo that the MgB2 crystalline grains were dense and well-distributed expert a few hollows, according to the experiment we found that the hollows may come of the dust pollutition of the system.
State invention patent: Date of authorization proclamation: September 10th, 2003; Patent number: ZL 01 1 28831.0; International Patent Classification number C23C 16/38

(3) Do the natural grain sieve analysis, and then make the evaluation particle size distribution and draw the grading curve
(3) Increase the number of layers.
If increasing the number of layers, lighting effect is forced to consider for the surrounding residents.

Simulation results and discussion Fig4 Clock offset performance of Collaborative synchronous Figure 4,=1 through computer simulation synchronous clock deviation of maximum likelihood estimation MSE and CRLB curve.Figure 4 shows the synchronization node on the interaction between the news the more the number, the higher the synchronization accuracy.
But for the purposes of the wireless sensor network, the more the number of messages exchanged between the node pair, it consumes more energy.
Fine-grained network time synchronization using reference broadcasts[C].

The formation of ambiguous interfaces can significantly degrade the optical performance of the DBRs and limit the number of pairs for stacking the mirrors.
No apparent voids or any large grain structures were found in the ITO bilayers, suggesting that Mie and Rayleigh scatterings could be neglected and the layers could be treated as homogeneous films with uniform refractive indices.
As expected, the sheet resistance of the DBRs decreased with increasing number of the period of the DBR structures.

PTRACE_TRACEME tells the kernel that the process is being traced PTRACE_PEEKUSER can read the system call number which saved the original contents of the exam register , etc.
The steps are following: ① PTRACE_ATTACH: parent can trace an existing process ②PTRACE_GETREGS: get register value, including system call numbers. ③PTRACE_PEEKDATA, PTRACE_POKEDATA: a word from location data is copied to the child's memory location adder.
For example, some experienced users would be able to use to gain fine-grained access control to input specific PID.

In industrial applications, exists great potential diversity, however, there are restrictions related to: the stiffness of the system robot/environment; the complexity of the programming interface and position control; the strong remaining limitations of the system speed response and the high cost of sensors to reduce the number of systems now in full operation, excluding devices demonstration, education and research.
The use of force control for machining can compensate the power demand by changing the cut rate or by a subdivision of the incremental number of machining passes.
The disc was used for grinding grain brown fused alumina, #100 mesh, glassy alloy, with an outer diameter of 40 mm and a thickness of 1.5 mm.

For example, if the abrasive tool wears by a slow glazing of the grains, the machining forces will rise and may lead to various problems such as poor size-holding, vibrations, and poor surface texture.
This is because that, the surface roughness is directly to the particle number Ng and the particle shape which participated in the grinding process.
The particle number Ng is increased with the increase of contact pressure under lower contact pressure, so the amount of grinding surface roughness decreases uniformly.